The prediction of performance, exhaust emissions and EGR effect is made by the SI engine cycle simulation. In this simulation several models are employed-two zone, thermodynamic combustion, mass fraction burned, heat transfer, chemical equilibrium, chemical kinetics for NO, laminar flame speed for ignition delay.
The chemical species in burned gas considered are 13 species-$CO_2$, CO, $O_2$, $H_2O$, $H_2$, OH, H, O, $N_2$, NO, $NO_2$, N, Ar - and the cylinder pressure, burned and unburned zone temperature and composition of gas are calculated at each crank angle through the compression, ignition delay, combustion and expansion processes.
To check the validity of the model, experimental study is done for measuring emissions, combustion pressure and engine outputs. The predicted values for pressure and emissions show qualitative agreement with the measured data and the EGR effect also shows similar tendency.